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DEBT - Convertible Senior Notes due 2023 Narrative (Details) - Convertible Notes - Convertible Senior Notes Due 2023 |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 05, 2019 USD ($) shares | Aug. 31, 2018 USD ($) $ / shares | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount |  | $ 65,000,000 | $ 5,000,000 | $ 5,000,000
Interest rate |  | 4.00% |  |
Debt converted | $ 60,000,000 |  |  |
Conversion shares (in shares) | shares | 10,801,080 |  |  |
Fees paid for repurchase and exchange of convertible notes | $ 6,000,000 |  |  |
Debt conversion price (in USD per share) | $ / shares |  | $ 5.56 |  |
Conversion ratio |  | 0.1800180 |  |
Redemption price percentage |  | 100.00% |  |

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